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Texas Instruments ESD562DBZR
- Part No.:
- ESD562DBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ESD562DBZR.pdf
- Description:
- TWO-CHANNEL BIDIRECTIONAL 12V ES
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
ESD562DBZR from Texas Instruments is a bidirectional transient voltage suppression (TVS) diode designed for I/O line protection in industrial RS-485/RS-422 interfaces. It provides ±22 kV contact and ±30 kV air-gap ESD immunity per IEC 61000-4-2, 3.5 A (8/20 µs) surge capability per IEC 61000-4-5, 12 V working voltage, and 1.5 pF typical line capacitance - enabling robust, high-speed signal integrity in factory automation and grid infrastructure systems.
For engineers reviewing the ESD562DBZR datasheet, ESD562DBZR pinout, ESD562DBZR application, or ESD562DBZR equivalent, this device serves as a low-capacitance, SOT-23 packaged ESD protector optimized for differential bus interfaces where clamping voltage, leakage current (<50 nA at ±12 V), and thermal reliability (RθJA = 250.4 °C/W) are critical selection criteria.
Technical Context
The ESD562DBZR implements a silicon avalanche diode architecture with symmetrical bidirectional snapback behavior, delivering matched positive/negative clamping voltages (VCLAMP = 21 V at ±3 A) and holding voltage (VHOLD = 16.5 V) to protect both signal polarities without polarity biasing. Its low dynamic resistance ensures minimal voltage overshoot during fast transients.
Designed specifically for RS-485/RS-422 differential pairs, it connects across A/Y and B/Z lines to ground, leveraging its 3-pin SOT-23 (DBZ) package with pins 1 and 2 as interchangeable I/O terminals and pin 3 as dedicated GND - supporting compact layout and AOI-compatible assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEC 61000-4-2 ESD | ±22 kV contact / ±30 kV air-gap - exceeds Level 4 immunity for industrial environments |
| IEC 61000-4-5 Surge | 3.5 A peak pulse current (8/20 µs) - protects against induced lightning surges on long cable runs |
| Working Voltage (VRWM) | ±12 V - matches RS-485 common-mode range and avoids false triggering during normal operation |
| Line Capacitance (CLINE) | 1.5 pF typical at 1 MHz - preserves signal integrity up to >50 Mbps on RS-485 buses |
| Clamping Voltage (VCLAMP) | 21 V at ±3 A (8/20 µs) - limits downstream IC stress below absolute maximum ratings of standard transceivers |
| Leakage Current | ≤50 nA at ±12 V - prevents DC loading or offset errors in precision analog or high-impedance receivers |
| Operating Temperature | −40 °C to +125 °C - supports deployment in uncontrolled industrial enclosures and outdoor grid nodes |
Pinout & Package
ESD562DBZR is housed in a leaded 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm with 1.12 mm max height, optimized for automated optical inspection and reflow soldering (MSL Level-1, 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O | Surge-protected bidirectional signal terminal - connects to one side of differential pair (e.g., A or Y) |
| 2 | I/O | Surge-protected bidirectional signal terminal - connects to opposite side of differential pair (e.g., B or Z) |
| 3 | GND | Dedicated low-inductance ground return path - must be connected directly to system ground plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional snapback TVS | Enables single-device protection of full-duplex RS-485/RS-422 differential signals without polarity constraints |
| 1.5 pF line capacitance | Minimizes signal distortion and timing skew on high-speed serial links up to 50 Mbps |
| 21 V clamping at 3.5 A | Keeps protected transceiver inputs within safe operating area during 8/20 µs surge events |
| ≤50 nA leakage at ±12 V | Prevents interference with receiver threshold detection and avoids power loss in battery-backed systems |
| SOT-23 (DBZ) footprint | Reduces PCB area by >40% vs. SOIC packages while maintaining compatibility with standard pick-and-place equipment |
Applications
| Factory Automation I/O Protection | Building Management RS-485 Networks |
|---|---|
|
Use Scenario: Protecting PLC digital input modules connected to 100+ meter RS-485 fieldbus cables exposed to ESD from maintenance personnel and surge from nearby motor switching. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed between transceiver A/B pins and chassis ground to clamp transients before they reach the RS-485 PHY. Use Value: Prevents latch-up or permanent damage to transceivers under repeated ±22 kV contact discharges while maintaining <1.5 pF loading for stable 10 Mbps communication. |
Use Scenario: Securing HVAC controller networks in commercial buildings where RS-422 links interconnect thermostats, VAV boxes, and central controllers across multiple floors. IC Role / Device Role / Timing Role: Low-capacitance ESD suppressor mounted at each node's bus interface to absorb air-gap discharges from static-prone indoor environments. Use Value: Ensures uninterrupted data transmission during ±30 kV air-gap ESD events without degrading rise/fall times or introducing jitter into temperature control commands. |
| Smart Grid RTU Communication | Security System Video Data Links |
|
Use Scenario: Hardening remote terminal units (RTUs) deployed in substations against induced surges from lightning strikes on adjacent overhead power lines. IC Role / Device Role / Timing Role: Surge protection element on RS-485 telemetry ports, coordinated with upstream MOVs and common-mode chokes for multi-stage defense. Use Value: Withstands 3.5 A (8/20 µs) surges without degradation, enabling compliance with IEC 61000-4-5 Level 3 requirements for outdoor utility equipment. |
Use Scenario: Shielding analog video-over-RS-422 links between IP camera encoders and central DVRs in perimeter security systems subject to frequent door-handle ESD. IC Role / Device Role / Timing Role: Differential-line ESD clamp installed at encoder output and DVR input to suppress transients propagating along coaxial or twisted-pair video cabling. Use Value: Maintains video signal fidelity with ≤1.5 pF capacitance, eliminating ghosting or sync loss during ±22 kV contact discharge events on enclosure surfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRSR | Unidirectional, 5.5 V VRWM, 0.9 pF capacitance, lower surge rating (1.5 A) | Targeted at USB/low-voltage data lines; insufficient for ±12 V RS-485 common-mode range | Select only for 3.3 V or 5 V interfaces requiring ultra-low capacitance; not suitable as direct replacement for ESD562DBZR |
| ESD5601DMPR | Bidirectional, 12 V VRWM, 1.8 pF capacitance, same 3.5 A surge rating, DFN-2 package | Offers comparable electrical specs but requires rework for solder paste volume and thermal pad layout | Preferred when board space is constrained and DFN-2 assembly capability exists; no change in circuit function or protection level |
Compared with TPD2E001DRSR and ESD5601DMPR, ESD562DBZR uniquely balances 12 V working voltage, 1.5 pF capacitance, and 3.5 A surge handling in a legacy-compatible SOT-23 footprint - making it optimal for drop-in upgrades of existing RS-485 designs without layout revision.
Availability
ESD562DBZR is available at Aetrix Electronics and suitable for factory automation I/O modules, building management RS-485 networks, and smart grid RTU communication requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ESD562DBZR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with over 50 years of leadership in industrial-grade protection devices.
The ESD562DBZR belongs to TI's industrial ESD protection portfolio, engineered specifically to meet the ruggedness, low-capacitance, and standardized test compliance needs of wired industrial communication interfaces like RS-485 and RS-422.
FAQ
What is the maximum continuous working voltage supported by ESD562DBZR?
The ESD562DBZR has a reverse stand-off voltage (VRWM) of ±12 V, meaning it can continuously withstand up to 12 V in either polarity across its I/O pins without conduction. This matches the common-mode voltage range of RS-485 transceivers and ensures reliable operation without false triggering during normal bus signaling. The device remains non-conductive until transient voltages exceed its breakdown threshold of 13.2 V.
How does ESD562DBZR achieve bidirectional protection with only three pins?
The ESD562DBZR uses an internal symmetrical dual-diode configuration tied to a common cathode-anode junction referenced to pin 3 (GND). Pins 1 and 2 are electrically identical I/O terminals - each forms a back-to-back diode path to ground, allowing equal clamping for positive and negative transients. This eliminates the need for separate anode/cathode assignments and enables flexible placement on differential signal pairs in the ESD562DBZR design.
Can ESD562DBZR be used to protect single-ended interfaces like CAN or UART?
ESD562DBZR is optimized for differential interfaces such as RS-485/RS-422 and is not recommended for single-ended buses like CAN or UART. Its bidirectional clamping is balanced for symmetric voltage swings, whereas CAN requires asymmetric protection (dominant/recessive logic levels) and UART often demands tighter VRWM tolerance. For those interfaces, TI recommends purpose-built devices like TCAN1042 (CAN) or ESD7L5.0ST5G (UART), which align with ESD562DBZR's protection philosophy but differ in topology and rating.
What is the thermal performance of ESD562DBZR under sustained surge conditions?
ESD562DBZR has a junction-to-ambient thermal resistance (RθJA) of 250.4 °C/W in its SOT-23 (DBZ) package. During short-duration transients (e.g., 8/20 µs surge), self-heating is negligible. However, under repetitive surges or elevated ambient temperatures (>85 °C), thermal derating applies: the 3.5 A surge rating assumes 25 °C ambient, and peak pulse power drops to ~42 W at 100 °C. Layout with adequate copper pour under pin 3 (GND) improves RθJB to 84.0 °C/W, enhancing sustained reliability in the ESD562DBZR application.
Is ESD562DBZR compatible with lead-free reflow processes?
Yes, ESD562DBZR is qualified for lead-free reflow with a moisture sensitivity level (MSL) rating of Level-1 (unlimited floor life) and a peak reflow temperature of 260 °C. Its NiPdAu (NIPDAU) lead finish ensures robust wetting and intermetallic formation during standard JEDEC J-STD-020-compliant profiles. The SOT-23 (DBZ) package's 1.12 mm max height and thermal mass allow uniform heating without tombstoning - confirmed in TI's assembly guidelines for the ESD562DBZR device.
ESD562DBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.2V
- Voltage - Clamping (Max) @ Ipp:
- 21V
- Current - Peak Pulse (10/1000µs):
- 3.5A (8/20µs)
- Power - Peak Pulse:
- 84W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1.5pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ESD562DBZR FAQ
1.How can I place an order for ESD562DBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for ESD562DBZR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ESD562DBZR reliable?
The price and inventory of ESD562DBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESD562DBZR is usually 5 days.
3.What payment methods are accepted for ESD562DBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESD562DBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESD562DBZR?
ESD562DBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESD562DBZR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ESD562DBZR?
For technical support, including ESD562DBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESD562DBZR requirements.
6.How does Aetrix verify that ESD562DBZR is sourced from the original manufacturer or authorized distributors?
All ESD562DBZR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ESD562DBZR meets industry standards.
7.What is the process for return or replacement of ESD562DBZR?
All ESD562DBZR units undergo pre-shipment inspection (PSI). If there is an issue with ESD562DBZR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ESD562DBZR part is unused and in its original packaging.
Return procedure for ESD562DBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESD562DBZR Tags
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